var can1;

var can2;

var ctx1;

var ctx2;

var canWidth;

var canHeight;

var lastTime;

var deltaTime;

var bgPic = new Image();

var ane;

document.body.onload = game;

function game()
{	
	init();

	lastTime = Date.now();

	deltaTime = 0;

	gameloop();
}

function init()
{
	// 获得canvas context
	can1 = document.getElementById("canvas1");	//	fishes, dust, UI, circle

	ctx1 = can1.getContext("2d");

	can2 = document.getElementById("canvas2");	//	background, ane, fruits

	ctx2 = can2.getContext("2d");

	bgPic.src = "./images/background.jpg";

	canWidth = can1.width;

	canHeight = can1.height;

	ane = new aneObj();

	ane.init();
}

function gameloop()
{
	window.requestAnimFrame(gameloop);	//	setInterval, setTimeout, frame per second

	var now = Date.now();

	deltaTime = now - lastTime;

	lastTime = now;

	drawBackground();

	ane.draw();
}